[RFC PATCH 1/3] riscv: add a generic implementation for cleanup_before_linux()

[Yao Zi]

Most RISC-V SoCs have similar cleanup_before_linux() functions. Let's
provide a weak symbol as fallback to reduce duplicated code.

Signed-off-by: Yao Zi <ziyao at disroot.org>
---
 arch/riscv/cpu/cpu.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c
index 06ecd92b9bc..5b31da64cbd 100644
--- a/arch/riscv/cpu/cpu.c
+++ b/arch/riscv/cpu/cpu.c
@@ -11,11 +11,13 @@
 #include <event.h>
 #include <hang.h>
 #include <init.h>
+#include <irq_func.h>
 #include <log.h>
 #include <asm/encoding.h>
 #include <asm/system.h>
 #include <asm/hwcap.h>
 #include <asm/cpufeature.h>
+#include <asm/cache.h>
 #include <dm/uclass-internal.h>
 #include <linux/bitops.h>
 #include <linux/log2.h>
@@ -729,3 +731,18 @@ void reset_cpu(void)
 	hang();
 }
 #endif
+
+/*
+ * cleanup_before_linux() is called just before we call linux, which prepares
+ * the processor for linux.
+ * this weak implementation is used by default. we disable interrupts and flush
+ * the cache.
+ */
+__weak int cleanup_before_linux(void)
+{
+	disable_interrupts();
+
+	cache_flush();
+
+	return 0;
+}
-- 
2.48.0